Cushion Cut Teal Sapphire Diamond Engagement Ring 14k.  This amazing teal colored 1.90 carat cushion cut sapphire is accented by .18 carats of round diamonds and set in 14 karat white gold. The sapphire has a very interesting shade of teal, where it appears a rather dark blue from the top, but at flatter angles a lovely green comes through. The strong claw style prongs emerging from the diamond adorned basket also add some gorgeous sparkle and symmetry.